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2) The manager of the cosmetics section of a large department store wants to determine whether newspaper advertising really does affect sales. For her experiment,
2) The manager of the cosmetics section of a large department store wants to determine whether newspaper advertising really does affect sales. For her experiment, she randomly selects 15 items currently in stock and proceeds to establish a baseline. The 15 items are priced at their usual competitive values, and the quantity of each item sold for a 1-week period is recorded. Then, without changing their price, she places a large ad in the newspaper, advertising the 15 items. She records the quantity sold for a 1-week period. The results are as follow: Item No. of Sold Before Ad No. of Sold After Ad 1 25 32 2 18 24 3 3 7 4 42 40 16 19 20 25 23 23 8 32 35 60 65 10 40 43 11 27 28 12 7 11 13 13 12 14 23 32 15 16 28 Using or = 0.052 tail, what can you conclude
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